[mkgmap-dev] overlapping highways and route restrictions

Wed Apr 4 09:58:43 BST 2018

yes I know - but even though both ways you linked have different turn
restriction ID - the content of the turn restriction is identical (only
straight on).

On 4 April 2018 at 10:54, Gerd Petermann <gpetermann_muenchen at hotmail.com>
wrote:

> Hi Felix,
>
> yes, 1) would handle the case in my example.
> Just to make sure: I meant turn restrictions, not route relations.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Mittwoch, 4. April 2018 10:48:20
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] overlapping highways and route restrictions
>
> For my maps 1) is enough - and warning not even needed. I think it's hard
> to find out what the outcome should be.
> The case of overlapping ways being part of different route relations on
> the other hand I've seen quite often - in that case I think it's best to
> just add all route relations to one way, and remove the other one.
>
> The example you found here - I think is quite possible to solve - both
> restriction relations are identical - so one way including the restriction
> relation can be removed, the route relations copied over. If the
> restriction is having different rules - then however I don't think we can
> solve it correctly (well an exception is if we have overlapping ways in OSM
> which are oneway and opposite to each other - this is a rare case where
> overlapping ways are not to be removed I guess).
>
>
>
> On 4 April 2018 at 10:39, Gerd Petermann <GPetermann_muenchen at hotmail.com
> <mailto:GPetermann_muenchen at hotmail.com>> wrote:
> Hi all,
>
> please help, I just try to make up my mind what mkgmap should do when it
> finds overlapping road segments and
> one (or both) of the overlaps is a part of a (valid) restriction
> relation.  This doesn't happen very often, but it is possible.
>
> The attached example contains these two overlapping ways, and both are
> members of (different) restriction relations:
> https://www.openstreetmap.org/way/48218016
> https://www.openstreetmap.org/way/48218008
>
> (I did not try what the trunk version produces for this mess)
>
> I see different possibilities:
> 1) ignore route restrictions when removing overlaps, remove those which
> are invalid after overlapping segments were removed and log a warning
> 2) ignore overlaps when the ways are members of restriction relations
> 3) complex: remove overlaps but try to "repair" the restriction
>
> I am currently trying to implement 3) but it looks too complicated for
> such a rare case and in the end we have a clear case of wrong input data
> here.
> What do you think?
>
> Gerd
>
>
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>
>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
> Schusterbergweg 32/8
> 6020 Innsbruck
> Austria - Österreich
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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Schusterbergweg 32/8
6020 Innsbruck
Austria - Österreich
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